Abstract
Oxygen consumptions of Galleria mellonella cadavers were measured following injection of nematodes from five isolates of Neoaplectana bibionis and one of Heterorhabditis heliothidis. Host death occurred after 24 hr with all isolates of N. bibionis but took 72 hr for H. heliothidis. Regressions are presented linking oxygen consumption per gram of host fresh weight per hour to time. N. bibionis-infested larvae consumed more oxygen than those containing H. heliothidis and the different isolates could be distinguished. It is concluded that N. bibionis utilizes host tissue more efficiently than does H. heliothidis. Comparison of the numbers of infective juveniles emerging from the host cadavers with the intercepts of the regressions separated the two nematode species, although the overall relationship may have been curvilinear. A strong linear relationship was found to exist between the numbers of emergent juveniles and the slopes of the regressions for all six nematode isolates studied. This relationship was improved if the relative size of the two species was taken into account.
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